func NewFSM(gConf *config.Global, pConf *config.Neighbor, peer *Peer) *FSM {
adminState := ADMIN_STATE_UP
if pConf.NeighborState.AdminDown == true {
adminState = ADMIN_STATE_DOWN
}
fsm := &FSM{
gConf: gConf,
pConf: pConf,
state: bgp.BGP_FSM_IDLE,
connCh: make(chan net.Conn, 1),
opensentHoldTime: float64(HOLDTIME_OPENSENT),
adminState: adminState,
adminStateCh: make(chan AdminState, 1),
getActiveCh: make(chan struct{}),
rfMap: make(map[bgp.RouteFamily]bool),
confedCheck: !config.IsConfederationMember(gConf, pConf) && config.IsEBGPPeer(gConf, pConf),
peerInfo: table.NewPeerInfo(gConf, pConf),
peer: peer,
}
fsm.t.Go(fsm.connectLoop)
return fsm
}
func NewFSM(gConf *config.Global, pConf *config.Neighbor, policy *table.RoutingPolicy) *FSM {
adminState := ADMIN_STATE_UP
if pConf.State.AdminDown {
adminState = ADMIN_STATE_DOWN
}
fsm := &FSM{
gConf: gConf,
pConf: pConf,
state: bgp.BGP_FSM_IDLE,
connCh: make(chan net.Conn, 1),
opensentHoldTime: float64(HOLDTIME_OPENSENT),
adminState: adminState,
adminStateCh: make(chan AdminState, 1),
getActiveCh: make(chan struct{}),
rfMap: make(map[bgp.RouteFamily]bool),
capMap: make(map[bgp.BGPCapabilityCode][]bgp.ParameterCapabilityInterface),
confedCheck: !config.IsConfederationMember(gConf, pConf) && config.IsEBGPPeer(gConf, pConf),
peerInfo: table.NewPeerInfo(gConf, pConf),
policy: policy,
}
fsm.t.Go(fsm.connectLoop)
return fsm
}
func (h *FSMHandler) recvMessageWithError() (*FsmMsg, error) {
sendToErrorCh := func(reason FsmStateReason) {
// probably doesn't happen but be cautious
select {
case h.errorCh <- reason:
default:
}
}
headerBuf, err := readAll(h.conn, bgp.BGP_HEADER_LENGTH)
if err != nil {
sendToErrorCh(FSM_READ_FAILED)
return nil, err
}
hd := &bgp.BGPHeader{}
err = hd.DecodeFromBytes(headerBuf)
if err != nil {
h.fsm.bgpMessageStateUpdate(0, true)
log.WithFields(log.Fields{
"Topic": "Peer",
"Key": h.fsm.pConf.Config.NeighborAddress,
"State": h.fsm.state.String(),
"error": err,
}).Warn("malformed BGP Header")
fmsg := &FsmMsg{
MsgType: FSM_MSG_BGP_MESSAGE,
MsgSrc: h.fsm.pConf.Config.NeighborAddress,
MsgData: err,
Version: h.fsm.version,
}
return fmsg, err
}
bodyBuf, err := readAll(h.conn, int(hd.Len)-bgp.BGP_HEADER_LENGTH)
if err != nil {
sendToErrorCh(FSM_READ_FAILED)
return nil, err
}
now := time.Now()
m, err := bgp.ParseBGPBody(hd, bodyBuf)
if err == nil {
h.fsm.bgpMessageStateUpdate(m.Header.Type, true)
err = bgp.ValidateBGPMessage(m)
} else {
h.fsm.bgpMessageStateUpdate(0, true)
}
fmsg := &FsmMsg{
MsgType: FSM_MSG_BGP_MESSAGE,
MsgSrc: h.fsm.pConf.Config.NeighborAddress,
timestamp: now,
Version: h.fsm.version,
}
if err != nil {
log.WithFields(log.Fields{
"Topic": "Peer",
"Key": h.fsm.pConf.Config.NeighborAddress,
"State": h.fsm.state.String(),
"error": err,
}).Warn("malformed BGP message")
fmsg.MsgData = err
} else {
fmsg.MsgData = m
if h.fsm.state == bgp.BGP_FSM_ESTABLISHED {
switch m.Header.Type {
case bgp.BGP_MSG_ROUTE_REFRESH:
fmsg.MsgType = FSM_MSG_ROUTE_REFRESH
case bgp.BGP_MSG_UPDATE:
body := m.Body.(*bgp.BGPUpdate)
confedCheck := !config.IsConfederationMember(h.fsm.gConf, h.fsm.pConf) && config.IsEBGPPeer(h.fsm.gConf, h.fsm.pConf)
_, err := bgp.ValidateUpdateMsg(body, h.fsm.rfMap, confedCheck)
if err != nil {
log.WithFields(log.Fields{
"Topic": "Peer",
"Key": h.fsm.pConf.Config.NeighborAddress,
"State": h.fsm.state.String(),
"error": err,
}).Warn("malformed BGP update message")
fmsg.MsgData = err
} else {
// FIXME: we should use the original message for bmp/mrt
table.UpdatePathAttrs4ByteAs(body)
err := table.UpdatePathAggregator4ByteAs(body)
if err == nil {
fmsg.PathList = table.ProcessMessage(m, h.fsm.peerInfo, fmsg.timestamp)
id := h.fsm.pConf.Config.NeighborAddress
for _, path := range fmsg.PathList {
if path.IsEOR() {
continue
}
if h.fsm.policy.ApplyPolicy(id, table.POLICY_DIRECTION_IN, path, nil) == nil {
path.Filter(id, table.POLICY_DIRECTION_IN)
}
}
} else {
fmsg.MsgData = err
}
}
fmsg.payload = make([]byte, len(headerBuf)+len(bodyBuf))
copy(fmsg.payload, headerBuf)
copy(fmsg.payload[len(headerBuf):], bodyBuf)
fallthrough
case bgp.BGP_MSG_KEEPALIVE:
// if the length of h.holdTimerResetCh
// isn't zero, the timer will be reset
// soon anyway.
select {
case h.holdTimerResetCh <- true:
default:
}
if m.Header.Type == bgp.BGP_MSG_KEEPALIVE {
return nil, nil
}
case bgp.BGP_MSG_NOTIFICATION:
body := m.Body.(*bgp.BGPNotification)
log.WithFields(log.Fields{
"Topic": "Peer",
"Key": h.fsm.pConf.Config.NeighborAddress,
"Code": body.ErrorCode,
"Subcode": body.ErrorSubcode,
"Data": body.Data,
}).Warn("received notification")
sendToErrorCh(FsmStateReason(fmt.Sprintf("%s %s", FSM_NOTIFICATION_RECV, bgp.NewNotificationErrorCode(body.ErrorCode, body.ErrorSubcode).String())))
return nil, nil
}
}
}
return fmsg, err
}
func (h *FSMHandler) recvMessageWithError() error {
headerBuf, err := readAll(h.conn, bgp.BGP_HEADER_LENGTH)
if err != nil {
h.errorCh <- FSM_READ_FAILED
return err
}
hd := &bgp.BGPHeader{}
err = hd.DecodeFromBytes(headerBuf)
if err != nil {
h.fsm.bgpMessageStateUpdate(0, true)
log.WithFields(log.Fields{
"Topic": "Peer",
"Key": h.fsm.pConf.Config.NeighborAddress,
"State": h.fsm.state,
"error": err,
}).Warn("malformed BGP Header")
h.msgCh <- &FsmMsg{
MsgType: FSM_MSG_BGP_MESSAGE,
MsgSrc: h.fsm.pConf.Config.NeighborAddress,
MsgDst: h.fsm.pConf.Transport.Config.LocalAddress,
MsgData: err,
}
return err
}
bodyBuf, err := readAll(h.conn, int(hd.Len)-bgp.BGP_HEADER_LENGTH)
if err != nil {
h.errorCh <- FSM_READ_FAILED
return err
}
now := time.Now()
m, err := bgp.ParseBGPBody(hd, bodyBuf)
if err == nil {
h.fsm.bgpMessageStateUpdate(m.Header.Type, true)
err = bgp.ValidateBGPMessage(m)
} else {
h.fsm.bgpMessageStateUpdate(0, true)
}
fmsg := &FsmMsg{
MsgType: FSM_MSG_BGP_MESSAGE,
MsgSrc: h.fsm.pConf.Config.NeighborAddress,
MsgDst: h.fsm.pConf.Transport.Config.LocalAddress,
timestamp: now,
}
if err != nil {
log.WithFields(log.Fields{
"Topic": "Peer",
"Key": h.fsm.pConf.Config.NeighborAddress,
"State": h.fsm.state,
"error": err,
}).Warn("malformed BGP message")
fmsg.MsgData = err
} else {
fmsg.MsgData = m
if h.fsm.state == bgp.BGP_FSM_ESTABLISHED {
switch m.Header.Type {
case bgp.BGP_MSG_UPDATE:
body := m.Body.(*bgp.BGPUpdate)
confedCheck := !config.IsConfederationMember(h.fsm.gConf, h.fsm.pConf) && config.IsEBGPPeer(h.fsm.gConf, h.fsm.pConf)
_, err := bgp.ValidateUpdateMsg(body, h.fsm.rfMap, confedCheck)
if err != nil {
log.WithFields(log.Fields{
"Topic": "Peer",
"Key": h.fsm.pConf.Config.NeighborAddress,
"error": err,
}).Warn("malformed BGP update message")
fmsg.MsgData = err
} else {
// FIXME: we should use the original message for bmp/mrt
table.UpdatePathAttrs4ByteAs(body)
fmsg.PathList = table.ProcessMessage(m, h.fsm.peerInfo, fmsg.timestamp)
id := h.fsm.pConf.Config.NeighborAddress
policyMutex.RLock()
for _, path := range fmsg.PathList {
if h.fsm.policy.ApplyPolicy(id, table.POLICY_DIRECTION_IN, path, nil) == nil {
path.Filter(id, table.POLICY_DIRECTION_IN)
}
}
policyMutex.RUnlock()
}
fmsg.payload = make([]byte, len(headerBuf)+len(bodyBuf))
copy(fmsg.payload, headerBuf)
copy(fmsg.payload[len(headerBuf):], bodyBuf)
fallthrough
case bgp.BGP_MSG_KEEPALIVE:
// if the lenght of h.holdTimerResetCh
// isn't zero, the timer will be reset
// soon anyway.
if len(h.holdTimerResetCh) == 0 {
h.holdTimerResetCh <- true
}
if m.Header.Type == bgp.BGP_MSG_KEEPALIVE {
return nil
}
case bgp.BGP_MSG_NOTIFICATION:
body := m.Body.(*bgp.BGPNotification)
log.WithFields(log.Fields{
"Topic": "Peer",
"Key": h.fsm.pConf.Config.NeighborAddress,
"Code": body.ErrorCode,
"Subcode": body.ErrorSubcode,
"Data": body.Data,
}).Warn("received notification")
h.errorCh <- FSM_NOTIFICATION_RECV
return nil
}
}
}
h.msgCh <- fmsg
return err
}